| 摘要 |
The invention is characterized by the provisions that each transmitter comprises an AC voltage or current source, respectively, as well as a plurality of inductive coupling elements supplied from said source, which elements are supplemented by at least one capacitor to form elements capable of resonating, and that furthermore one control elements is that controls said AC voltage or current source, respectively, in such a way that the latter operates on a resonant frequency of said elements capable of resonating.
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